docs: def execute(self, slave_id, route_map):
          """ Execute the Modbus function registered for a route.
  
          :param slave_id: Slave id.
          :param eindpoint: Instance of modbus.route.Map.
          """
          endpoint = route_map.match(slave_id, self.function_code, self.address)
          try:
              endpoint(slave_id=slave_id, address=self.address, value=self.value,
                       function_code=self.function_code)
          # route_map.match() returns None if no match is found. Calling None
          # results in TypeError.
          except TypeError:
              raise IllegalDataAddressError()